3 paste version
Phenomenon and reason: When the paste version is unclear, the dot lines are enlarged, and the neighboring dots are merged with each other, so that the printed ink is dark and thick and the layers are reduced. The reasons for stencil are: In addition to the fact that the syrup is too hot, the pressure of the roller is too large, and the blanket is too loose, the following reasons are commonly caused by the ink:
(1) The ink is adjusted too thinly and the texture is too loose. The cohesion is small, and it is easy to spread outwards, resulting in the expansion of dots and lines.
(2) When the amount of ink under the ink is large, and it exceeds the amount of ink that can be accommodated in the layout pattern, it spreads out to cause a paste.
Fine network printing must strictly control the ink quality, otherwise it is easy to paste
(3) Ink pigments are too thick or too heavy, and the transfer properties of the linking material are reduced, resulting in deposits blocking the dots on the plate. On the other hand, because the particles are too thick, the fine mesh can not accommodate and expand outwards, and at the same time, the friction on the plate increases, destroying the hydrophilic properties of the blank parts and making them feel fat, causing the adjacent dots to merge and paste.
(4) The weight of the ink makes the blank part of the plate feel fat and produces a paste plate. If too much auxiliary material is added to the ink, the viscosity of the ink may be reduced, the ink may become loose, and the oiliness of the ink may increase.
(5) The ink accumulates on the plate, blocking the gaps in the dots, expanding the lines, and causing stencils.
Approach:
(1) Paste of ink occurs frequently in gold and red ink, and some gum arabic may be properly added in the water bucket. Can also be diluted with 915 Wei Li oil and 05-93 light pulp half, the use of better results. Most of the ink is too thin, resulting in the paste is too thin and the resulting paste, replace the new ink or add some concentrated ink.
(2) When the ink is large, the color of the ink can be adjusted to reduce the amount of ink.
(3) Reduce the use of accessories such as Kangbang to control the paste.
(4) The stencils caused by the stack are to be resolved from the root cause of the heap.